Extrusion & Post
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Die marks/lines appearing on polyolefin plastomer extruded products
Fenómeno del problema
Continuous lines or marks appear on the extrudate surface along the extrusion direction, with fixed positions.
Die marks affect the product appearance and are particularly obvious in transparent products and films.
Análisis de la causa
（1）The die inner wall has scratches or damage
（2）Impurities or carbides accumulate in the die
（3）The die flow channel design is unreasonable, with stagnation zones
（4）The die joint is uneven
（5）The breaker plate or screen is damaged and impurities pass through
Solución
（1）Disassemble the mold and check the die inner wall; scratches need to be ground and polished for repair
（2）Clean the impurities and carbides in the die, using copper tools to avoid damage
（3）Optimize the die flow channel design to eliminate stagnation dead corners
（4）Grind the die joint flat to ensure no steps
（5）Replace the breaker plate and screen, and replace them regularly to prevent damage
Conclusión clave
Die marks are caused by damage to the die inner wall or impurities, and the die condition needs to be regularly cleaned and checked.
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